Alert archive / Pennsylvania / Tornado Warnings in 1999

Tornado Warning 1, NWS Pittsburgh, PA

April 9, 1999Westmoreland County, Pennsylvania

NWS Pittsburgh, PA issued this tornado warning at Apr 9, 1999, 3:39 PM EDT for Westmoreland County, Pennsylvania. It was in force for 51 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Apr 9, 1999, 3:39 PM EDT (19:39 UTC)
Expired
Apr 9, 1999, 4:30 PM EDT
In force
51 min
Issued by
NWS Pittsburgh, PA
Area
Whole counties

County Westmoreland County, PA

The radar

The Pittsburgh radar (KPBZ), 68 km from the middle of the area, began a volume at 19:41 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
Apr 9, 3:42 PM EDTHail 0.75Stahlstown, PA

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 9, 12:30 PM EDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 7.7 hours before the alert went out and 233 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Washington/Dulle, VA at 12:00Z on 1999-04-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 12:00Z on 1999-04-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 307 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2194 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
307 m²/s²
0-3 km storm-relative helicity
614 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

999 
WFUS1 KPIT 091940 RRA
TORPIT
PAC129-092030-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE PITTSBURGH PA
339 PM EDT FRI APR 9 1999

THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS ISSUED A

* TORNADO WARNING FOR...
  WESTMORELAND COUNTY IN SOUTHWESTERN PENNSYLVANIA.

* UNTIL 430 PM EDT.

* AT 335 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  TORNADO JUST WEST OF MT PLEASANT...MOVING EAST
  AT 40 MPH.

* THE TORNADO WILL BE NEAR...
  YOUNGWOOD AT 345 PM.
  WEST FAIRFIELD AT 355 PM.

<<CALL TO ACTION>>IF YOU ARE IN A CAR...GO IN A NEARBY STURDY
BUILDING AS A LAST RESORT LIE FLAT IN A DITCH AND COVER YOUR HEAD.

.END/

What forecasters said that day

The local office's own words before this tornado warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Apr 9, 11:55 AM EDT, 3 hours 44 minutes before
MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023-
029>032-WVZ001>004-012-021>023-041-092000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
1155 AM EDT FRI APR 9 1999

...SEVERE THUNDERSTORMS POSSIBLE THIS AFTERNOON AND EVENING...

THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS ACROSS EAST CENTRAL
OHIO...NORTHERN WEST VIRGINIA...SOUTHWESTERN PENNSYLVANIA...AND
GARRETT COUNTY MARYLAND.

AN UPPER LEVEL DISTURBANCE AND ASSOCIATED SURFACE LOW WILL BE
APPROACHING THE REGION FROM THE WEST THIS AFTERNOON.  THE ATMOSPHERE
WILL REMAIN QUITE UNSTABLE AHEAD OF THIS DISTURBANCE AND THUNDERSTORMS
ARE EXPECTED TO REDEVELOP ACROSS THE REGION THIS AFTERNOON.  IT APPEARS
THAT DAMAGING STRAIGHT-LINE WINDS AND LARGE HAIL WILL BE THE MAIN SEVERE
WEATHER THREAT THIS AFTERNOON. THE THUNDERSTORMS WILL MOVE INTO EAST
CENTRAL OHIO AS EARLY AS 100 TO 200 PM AND INTO WESTERN PENNSYLVANIA AND
NORTHERN WEST VIRGINIA BY 300 TO 400 PM.

IN ADDITION...HEAVY DOWNPOURS ASSOCIATED WITH THESE STORMS MAY PRODUCE
LOCALIZED FLOODING PROBLEMS...ESPECIALLY WHERE SEVERAL STORMS PASS OVER
THE SAME LOCATION.  ISOLATED RAINFALL AMOUNTS OF OVER ONE INCH ARE
POSSIBLE.

AS A RESULT...SKYWARN AND HAM RADIO NETWORK ACTIVATION MAY BE NEEDED
THIS AFTERNOON.

STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA SOURCES
FOR FURTHER UPDATES ON THIS SEVERE WEATHER POTENTIAL.

WJD/RWH
Special weather statement, Apr 9, 11:55 AM EDT, 3 hours 44 minutes before
MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023-
029>032-WVZ001>004-012-021>023-041-092000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
1155 AM EDT FRI APR 9 1999

...SEVERE THUNDERSTORMS POSSIBLE THIS AFTERNOON AND EVENING...

THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS ACROSS EAST CENTRAL
OHIO...NORTHERN WEST VIRGINIA...SOUTHWESTERN PENNSYLVANIA...AND
GARRETT COUNTY MARYLAND.

AN UPPER LEVEL DISTURBANCE AND ASSOCIATED SURFACE LOW WILL BE
APPROACHING THE REGION FROM THE WEST THIS AFTERNOON.  THE ATMOSPHERE
WILL REMAIN QUITE UNSTABLE AHEAD OF THIS DISTURBANCE AND THUNDERSTORMS
ARE EXPECTED TO REDEVELOP ACROSS THE REGION THIS AFTERNOON.  IT APPEARS
THAT DAMAGING STRAIGHT-LINE WINDS AND LARGE HAIL WILL BE THE MAIN SEVERE
WEATHER THREAT THIS AFTERNOON. THE THUNDERSTORMS WILL MOVE INTO EAST
CENTRAL OHIO AS EARLY AS 100 TO 200 PM AND INTO WESTERN PENNSYLVANIA AND
NORTHERN WEST VIRGINIA BY 300 TO 400 PM.

IN ADDITION...HEAVY DOWNPOURS ASSOCIATED WITH THESE STORMS MAY PRODUCE
LOCALIZED FLOODING PROBLEMS...ESPECIALLY WHERE SEVERAL STORMS PASS OVER
THE SAME LOCATION.  ISOLATED RAINFALL AMOUNTS OF OVER ONE INCH ARE
POSSIBLE.

AS A RESULT...SKYWARN AND HAM RADIO NETWORK ACTIVATION MAY BE NEEDED
THIS AFTERNOON.

STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA SOURCES
FOR FURTHER UPDATES ON THIS SEVERE WEATHER POTENTIAL.

WJD/RWH
Local storm report, Apr 9, 3:06 PM EDT, 33 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH, PA
306 PM EDT FRI APR 09 1999

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0120 PM    ZANESVILLE                OH   WIND DAMAGE
04/09/99   MUSKINGUM                      POWER LINES DOWN

0130 PM    ZANESVILLE MUNI ARPT      OH   58 MPH TSTM GUST
04/09/99   MUSKINGUM

0144 PM    NEW MOSCOW                OH   WIND DAMAGE
04/09/99   COSHOCTON                      TREES AND POWER LINES DOWN

0150 PM    AVA                       OH   WIND DAMAGE
04/09/99   NOBLE                          TREES AND POWER LINES DOWN

0200 PM    KIMBOLTON                 OH   WIND DAMAGE

0200 PM    NEWCOMERSTOWN             OH   WIND DAMAGE
04/09/99   TUSCARAWAS                     TREE DOWN

0215 PM    BETHESDA                  OH   WIND DAMAGE
04/09/99   BELMONT                        TREES DOWN

0220 PM    POWHATAN PT               OH   65 MPH TSTM GUST
04/09/99   BELMONT                        ESTIMATED WINDS 60-70MPH

0229 PM    WHEELING ARPT             WV   58 MPH TSTM GUST
04/09/99   OHIO

0230 PM    FAIRVIEW                  WV   58 MPH TSTM GUST
04/09/99   MARSHALL                       ESTIMATED

0235 PM    WHEELING                  WV   1 INCH HAIL
04/09/99   OHIO

0239 PM    RAYLAND                   OH   WIND DAMAGE
04/09/99   JEFFERSON                      TREE DOWN
NNNN
Local storm report, Apr 9, 3:06 PM EDT, 33 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH, PA
306 PM EDT FRI APR 09 1999

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0120 PM    ZANESVILLE                OH   WIND DAMAGE
04/09/99   MUSKINGUM                      POWER LINES DOWN

0130 PM    ZANESVILLE MUNI ARPT      OH   58 MPH TSTM GUST
04/09/99   MUSKINGUM

0144 PM    NEW MOSCOW                OH   WIND DAMAGE
04/09/99   COSHOCTON                      TREES AND POWER LINES DOWN

0150 PM    AVA                       OH   WIND DAMAGE
04/09/99   NOBLE                          TREES AND POWER LINES DOWN

0200 PM    KIMBOLTON                 OH   WIND DAMAGE

0200 PM    NEWCOMERSTOWN             OH   WIND DAMAGE
04/09/99   TUSCARAWAS                     TREE DOWN

0215 PM    BETHESDA                  OH   WIND DAMAGE
04/09/99   BELMONT                        TREES DOWN

0220 PM    POWHATAN PT               OH   65 MPH TSTM GUST
04/09/99   BELMONT                        ESTIMATED WINDS 60-70MPH

0229 PM    WHEELING ARPT             WV   58 MPH TSTM GUST
04/09/99   OHIO

0230 PM    FAIRVIEW                  WV   58 MPH TSTM GUST
04/09/99   MARSHALL                       ESTIMATED

0235 PM    WHEELING                  WV   1 INCH HAIL
04/09/99   OHIO

0239 PM    RAYLAND                   OH   WIND DAMAGE
04/09/99   JEFFERSON                      TREE DOWN
NNNN

The office that day

Everything else NWS Pittsburgh, PA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 9, 2:33 PM EDTSevere Thunderstorm WarningPBZWashington58 min
Apr 9, 2:44 PM EDTSevere Thunderstorm WarningPBZGreene59 min
Apr 9, 2:52 PM EDTFlash Flood WarningPBZAllegheny, Washington3 hr
Apr 9, 2:54 PM EDTSevere Thunderstorm WarningPBZAllegheny60 min
Apr 9, 2:58 PM EDTFlash Flood WarningPBZFayette, Greene3 hr
Apr 9, 3:11 PM EDTSevere Thunderstorm WarningPBZFayette, Westmoreland79 min
Apr 9, 4:06 PM EDTFlash Flood WarningPBZBeaver2 hr
Apr 9, 4:19 PM EDTFlash Flood WarningPBZWestmoreland3 hr
Apr 9, 4:23 PM EDTFlash Flood WarningPBZButler3 hr
Apr 9, 5:51 PM EDTFlash Flood WarningPBZWashington, Westmoreland4 hr
Apr 9, 6:59 PM EDTFlash Flood WarningPBZFayette3 hr

Nearby

Tornado Warnings in Pennsylvania, 1999Every tornado warning in 1999Tornadoes in 1999

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.